Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/48835

TitleObservation of Spin Correlation in t(t)over-bar Events from pp Collisions at root s=7 TeV Using the ATLAS Detector
Author(s)Onofre, A.
Castro, Nuno Filipe Silva Fernandes
ATLAS Collaboration
Issue date2012
PublisherAmerican Physical Society
JournalPhysical Review Letters
CitationAad, G., Abbott, B., Abdallah, J., Khalek, S. A., Abdelalim, A. A., Abdesselam, A., . . . Collaboration, A. (2012). Observation of Spin Correlation in t(t)over-bar Events from pp Collisions at root s=7 TeV Using the ATLAS Detector. Physical Review Letters, 108(21). doi: 10.1103/PhysRevLett.108.212001
Abstract(s)A measurement of spin correlation in t¯t production is reported using data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 2.1  fb−1. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The difference in azimuthal angle between the two charged leptons in the laboratory frame is used to extract the correlation between the top and antitop quark spins. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.40+0.09−0.08, in agreement with the next-to-leading-order standard model prediction. The hypothesis of zero spin correlation is excluded at 5.1 standard deviations.
TypeArticle
URIhttp://hdl.handle.net/1822/48835
DOI10.1103/PhysRevLett.108.212001
ISSN0031-9007
e-ISSN1079-7114
Publisher versionhttps://journals.aps.org/prl/abstract/10.1103/PhysRevLett.108.212001
Peer-Reviewedyes
AccessOpen access
Appears in Collections:LIP - Artigos/papers

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